In this June 16, 2011 photo, traders work on the ...

Richard Drew | published: June 17, 2011

In this June 16, 2011 photo, traders work on the floor of the New York Stock Exchange. World markets fell Friday, June 17, despite positive economic data out of the U.S., as a political shake-up in Greece added to worries that the country might be forced to default on its debt. (AP Photo/Richard Drew)